Portable tank



FIG. 1 is a top front left perspective view of a portable tank of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a left side thereof;

FIG. 5 is a right side thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

CLAIM The ornamental design for a portable tank, as shown and described. 